Display Color Filter for Viewing Angle Luminance Uniformity
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Solution Overview
Problem
Display apparatuses face issues with luminance differences and color variations when viewed from different angles due to constructive interference of light from sub-pixel electrodes and opposite electrodes, leading to inconsistent color perception.
Innovation Solution
The implementation of a color filter layer or a reflection adjustment layer in the display apparatus, which includes materials that absorb light in specific wavelength ranges, helps to reduce luminance differences and color variations by adjusting the luminance and wavelength distribution of light emitted from pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflective sub-pixel electrode and opposite electrode are positioned to maximize front light luminance through constructive interference, then front light luminance is improved, but side light luminance and color consistency deteriorate due to wavelength range differences
Solution Approach 1:
The patent introduces a color filter layer with specific wavelength transmission characteristics positioned at the light emission region. This local modification selectively transmits light in a targeted wavelength range (e.g., 450-550nm), improving color consistency for side light viewing while preserving front light luminance through constructive interference from the reflective electrodes.
2Illumination intensity
If constructive interference is optimized for front light emission, then front light luminance increases, but wavelength difference between front light and side light increases causing color variation
Solution Approach 1:
The patent modifies the wavelength transmission parameter by introducing a color filter layer with specific spectral characteristics. This filter changes the wavelength distribution of emitted light to ensure that both front light and side light fall within a consistent wavelength range, thereby uniformizing color perception across different viewing angles while maintaining front light luminance enhancement.
3Use of energy by moving object
If reflective electrodes are used to enhance light emission, then luminance efficiency is improved, but viewing angle dependence and color shift worsen
Solution Approach 1:
The color filter layer acts as an intermediary element between the reflective electrodes and the observer. It mediates the wavelength distribution of light emitted from the reflective electrodes, ensuring that the constructive interference pattern produces consistent color perception across different viewing angles by selectively transmitting appropriate wavelength ranges.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the uniformity of color perception across different viewing angles by increasing the luminance ratio of side light to front light and reducing the wavelength difference between front and side light, thereby improving the overall visibility and color consistency of the display apparatus.
Implementation Method 1
a color filter layer or a reflection adjustment layer as disclosed herein may reduce the differences between front light and side light emitted from pixels of a display apparatus
Implementation Method 2
A sub-pixel electrode or an opposite electrode in a pixel of a display apparatus may be reflective and positioned so that constructive interference of light emitted from a light-emitting layer increases the luminance of front light
Data Source
AI summary
A display apparatus includes first, second, and third light-emitting devices on a substrate, an encapsulation layer covering the first through third light-emitting devices, a touch electrode disposed on the encapsulation layer and having a first opening, a second opening, and a third opening, the first opening, the second opening, and the third opening overlapping the first light-emitting device, the second light-emitting device, and the third light-emitting device, respectively, a touch insulating layer on the encapsulation layer, a color filter layer or reflection adjustment layer disposed on the touch insulating layer and also disposed in the second opening of the touch electrode overlapping the second light-emitting device, and a planarization layer. The planarization layer may directly contact an upper surface of the touch insulating layer through the first and third openings.